dodge79, RCAddict mentioned using a flip kit part for chevies that will work for the Dodge on the first page of this thread, and it costs about $35-40 bucks. Truth is, however, all you need to do the flip is is get anther set of Mopar spring perches, which you can get from Jeg's or Summit cheaper than that chevie flip kit (they're only $12.99), and weld them directly under the spring perches currently on your rear end. If you aren't a welder, take it to someone who is. If you make sure the new perches are welded in parrellel to to originals, you should have no issues with pinion angle. I'd say you'll need the square type "U" bolts for that, and then you'll need shorter shocks. That's it.
That's it.